T1 configuration problem

Answered Question
Jul 30th, 2010

Hello everyone

I have T1 HWIC in slot 2 and T1 Network module in slot 2 . Router is 3845.

If I configure first HWIC T1 for channel-group 0 timeslots 1-24 speed 64 then I'm not able to configure Module T1. I'm getting this error:

Router(config-controller)#channel-group 0 timeslots 1-24 speed 64
%Insufficient resources to create channel group
Router(config-controller)#
*Jul 30 21:52:23.111:  No Free HDLC resources (8)

If I configure first Module then I'm not able to configure HWIC. Do you know why ? Are they sharing some resources ?

Correct Answer by Nagaraja Thanthry about 6 years 6 months ago

Hello,

NM-HDV module supports a maximum of 32 HDLC channels with a bandwidth of 2

Mbps. So, when you configure timeslots, since you have already configured 24

slots on one card, you can at the maximum support 8 on the second.

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t7/feature/guide/hdd_vfnm....

http://www.cisco.com/warp/public/cc/pd/rt/ps282/prodlit/guido_ds.pdf

Data Features (Only Supported on NM-HD-2VE)

. Support serial data WAN access using T1/E1 or fractional T1/E1 network

interface

. N X 64 Kbps or N X 56 Kbps channel group data rates (T1:N=1 to 24, E1:N=1

to 31)

. Supports up to 32 data channel groups with a total bandwidth of up to 2

Mbps

. Supports integrated data WAN access and DS-0 voice channels on the same

T1/E1

Hope this answers your questions.

Regards,

NT

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jean.moncada Fri, 07/30/2010 - 21:02

You may have independent clocking configured, if you do then the controller will only support one channel group.

Jean Paul Moncada

martin.bednar@a... Sat, 07/31/2010 - 03:20

Thank you for your help

I have to types of cards in router: NM-HDV2-2T1/E1 and VWIC2-2MFT-T1/E1. Let’s say I want to configure Network Module in slots 3/0, 3/1 and VWIC in slots 3/0/0 and 3/0/1.

If I start with configuration of VWIC, I’m not able to configure Network Module:

Router(config)#controller t1 3/0/0

Router(config-controller)#channel-group 0 timeslots 1-24

Router(config-controller)#controller t1 3/0/

*Jul 31 09:48:06.829: %LINK-3-UPDOWN: Interface Serial3/0/0:0, changed state to down

*Jul 31 09:48:07.829: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/0/0:0, changed state to down

Router(config-controller)#controller t1 3/0/1

Router(config-controller)#channel-group 0 timeslots 1-24

Router(config-controller)#controller t1 3/0

*Jul 31 09:48:12.797: %LINK-3-UPDOWN: Interface Serial3/0/1:0, changed state to down

*Jul 31 09:48:13.797: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial3/0/1:0, changed state to down

Router(config-controller)#controller t1 3/0

Router(config-controller)#channel-group 0 timeslots 1-24

%Insufficient resources to create channel group

Router(config-controller)#

*Jul 31 09:48:16.469:  No Free HDLC resources (8)

But if I remove channel-group from VWIC I’m able to configure Network Module:

Router(config-controller)#controller t1 3/0/1

Router(config-controller)#no cha

Router(config-controller)#no channel-group 0

Router(config-controller)#controller t1 3/0

Router(config-controller)#channel-group 0 timeslots 1-24

Router(config-controller)#

And this is what I don’t understand. I thought that if NM-HDV2-2T1/E1 can create only 1 full T1 channel group then I will be able to create 2 full T1 with VWIC2-2MFT-T1/E1 and 1 full T1 with NM-HDV2-2T1/E1. But I’m only able to create 2 full T1s and it doesn’t matter if I create them on NM-HDV2-2T1/E1 or VWIC2-2MFT-T1/E1. It depends only on which card I start configuring first.

If I remove channel-group from VWIC I can have 2 full T1s on NM-HDV2-2T1/E1

Router(config)#controller t1 3/0/0

Router(config-controller)#no channel-group 0

Router(config-controller)#controller t1 3/1

Router(config-controller)#channel-group 0 timeslots 1-24

I hope you understand what I’m asking.

Correct Answer
Nagaraja Thanthry Sat, 07/31/2010 - 08:45

Hello,

NM-HDV module supports a maximum of 32 HDLC channels with a bandwidth of 2

Mbps. So, when you configure timeslots, since you have already configured 24

slots on one card, you can at the maximum support 8 on the second.

http://www.cisco.com/en/US/docs/ios/12_3t/12_3t7/feature/guide/hdd_vfnm....

http://www.cisco.com/warp/public/cc/pd/rt/ps282/prodlit/guido_ds.pdf

Data Features (Only Supported on NM-HD-2VE)

. Support serial data WAN access using T1/E1 or fractional T1/E1 network

interface

. N X 64 Kbps or N X 56 Kbps channel group data rates (T1:N=1 to 24, E1:N=1

to 31)

. Supports up to 32 data channel groups with a total bandwidth of up to 2

Mbps

. Supports integrated data WAN access and DS-0 voice channels on the same

T1/E1

Hope this answers your questions.

Regards,

NT

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